Clamping-jaw for watch-makersj lathes



(No Model.)

E. RIVETT.

GLAMPING JAW FOR WATCH MAKERS LATHES. No. 375,771. Patented Jan. 8, 1888.

- it has a horizontal perforation, in which is in- 45 f, to the faceplate d, the latter is clamped'be-- A UNITED STATES' EDW'ARD RIVETT, OF BOSTON, MASSACHUSETTS.

CLAMPlNG-JAW FOR WA TCH-MAKERS LATHES.

SPECIFICATION forming part of Letters Patent No. 375,771, dated January 3, 1888.

Application led July 1l, 1887. Serial No. 243.956. (No model.)

T0 all whom, it may concern:

Be it known that I, EDWARD RIVETT, a citizen of the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful lmprovementsn Clamping-Jaws for W'atch- Makers Lathes, of which the following, taken in connection with the accompanying draw ings, is a specification.

rIhis invention relates to improvements in clamping-jaws for watch-makers7 lathes, and itis carried out as follows, reference being had to the accompanying drawings, wherein- Figure 1 represents a side view of a lathe head-stock and faceplate provided with my improved clamping-jaws. Fig. 2 represents an end View of the same. Fig. 3 represents an enlarged cross-section of the faceplate and clamping-jaw on the line A Bin Fig. 2. Fig. 4l represents an enlarged longitudinal section of said parts on the line C D, also shown in Fig. 2; and Fig. 5 represents an enlarged cross section on the line E Fshown in Fig. l.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

a represents the head-stock of a watch-makers lathe, on which b is the hollow spindle, c the cone-pulley, and d the faceplate, with its center pin, e, in the usual manner.

d d d are radial slots in the face-plate d, in which the clamping-jaws are made adjustable, according to the size of the object to be held and secured in the 'clamping-jaws.

f is the inner cla1npingjaw,and g is the outer one. The inner jaw, f, is adapted to be held firmly against the front of the face-plate d, and

When it is desired to secure the inner Jaw,

tween the under side'of the jawf and flange h of the sleeve 7L by means of the set-screw i, (shown in Fig. 3,) that is screwed through the hub of thejawf, and has itsinner tapering end, fi", adapted to press against an inclined face, It, forming one portion of the tapering or slotted hole or recess or depression ha, made in the sleeve h, as shown in Fig. 3, and it will thus be seen that when the screwi is tightened up its lower tapering or rounded end, i', comes in contact with the incline h in the sleeve It, and thus causes the under sides of the flange h' and jawf to be clamped against opposite sides of the face-plate d. By loosening the .r screw z the said flange and jaw are loosened fr'oni the face-plate d, thus enabling the sleeve h to be moved to any desired part of the slot d', and there to be secured in the same manner, according to the size of the object to be held in the clamping-jaws.

The outer clamping-jaw, g, is provided with the spindle g', passing through and made ad justable in the sleeve h, as shown in Figs. 3, 4., and 5. The spindle g is screw-threaded in its rear end and provided with a regulating thumb-nut, g, having near its forward end an annular groove,g3,in which is tted the washer or plate lc, that is preferably made in the form of aslitted disk, (shown in Fig. 5,) and securedby means of screws 7c k' to the flange h, as shown in Fig. 3; but the particular form of said washer is not important, as it may be made in two halves or other suitable manner without departing from the essence of my invention. By turning the thumbnut a longitudinal adjustlnent of the clamping-jaw g to or from the inner jaw,f, is obtained. The jaw g has secured to its outer end the pin G, which is arranged parallel with the spindle g', as shown in Fig. 4, and it is guided in the quill or sleeve F, secured to the outer end of the jaw f, by which arrangement the latter and its spindle are prevented from turning round when adj usted relatively to the jaw f.

The quill or sleeve F is exteriorly screwthreaded, as is usual in devices of this kind, and surrounded by an adjustable thumb-nut, F', which serves as a back-rest for the jaws and prevents their springing out of parallel positions when the object to be turned in the lathe is clamped by the thumb-nutg between saidjawsfand g.

In using this my improved clamping-jaw I proceed as follows: By loosening the set-screw t' the jaw f and collar h are made free to be adjusted on the face-plate d out or in as far as the slot d will admit. After the jaw f has ICO been moved to thedesiredposition,itis clamped firmly to the face-plate d simply by turning the set-screw ,Yas above described. The article to be clamped is then introduced between the jaws f g and clamped between the latter simply by turning the thumbnut y and adiusting the nut F at the back end of thejaws accordingly. It will thus be seen that I ernploy two independent, positive, and simple devices-one for securing the jawfto the faceplate and another for operating the outerjaw, g, to or from thejawf, as above described.

Vhat I Wish to secure by Letters Patent and claim is 1. In lathes, the slotted faceplate d, the jaw g, and the sleeve h, having flange h iu one end and inclined face or recess h" h3 in the other, in combination with Vthe clamping-jaw j', journaled on said sleeve and having the setscrew z' t, for the purpose of securing the said clamping-jaw and sleeve to the face-plate, as Set forth.

2. In lathes, the flanged sleeve h h', having the inclined face or recess h h3, and the jawf,

journaled on said sleeve and provided with the set-screw i t, in combination with the aw g having the spindle g', adapted to slide in the sleeve h, and having the nut g, connected to said sleeve, for the operation of the jawg to and from thejawf, as set forth.

3. The anged sleeve h h and the jaw f, having the SetscreWiz", arranged as described, for clamping said parts against opposite sides of the slotted faceplate d, in combination with the jaw g, having spindle g', adapted to pass through the sleeve h, and having regulating- `nut g for its manipulation, and the back-rest device F F G at the rear of the jaws fg, as setforth. Y L

In testimony WhereofI have signed my name to this specification, in the presence of-two subscribing'wit-nesses, on this 2d day of July, A. D. 1887.

EDWARD RIVET'I.

Wit ncsses:

ALBAN ANDRN, HENRY CHADBOURN. 

